Fireproof material.



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COATING OR PLASTIC.

UNITED STATES PXTENT OFFICE.

GEABLES BOSS, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF 'IO HARRY SHALLEB, OF ST. LOUIS, MISSOURI.

FIBEPBOOF MATERIAL.

1,111,021. I Drawing.

Patented Sept. 22, 1914.

To all whom it may concern Be it known that I, CHARLES Hoss, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Fireproof Material, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

his invention relates to compositions of matter, and has for its main object to provide an inexpensive and efficient fireproof material.

Another object is to provide a novel method of making fireproof material.

Briefly described, my improved material consists of a granular or shredded substance that is a poor conductor or non-conductor of heat, a binding agent mixed with said substance so as to hold it together, and a fireproofing agent thoroughly distributed through said mass.

The mixture above-described is molded or pressed into sheets or into any other desired shape, and is then preferably treated with a solution or substance that will impart stifiness and strength to the material. I prefer to form the material from sawdust, silicate of sodium and soa stone mlxed togethe'f'm 'a'plastic' or semi p astic condition and mold it into flat sheets or any other desired shape, and then treat it with a chlorid of zinc solution, but I do not wish it to'be understood that my invention is limited to the substance or ingredients above-mentioned for wood pulp could be used instead of sawdust, and any other suitable fireproofing agent could be used instead of the silicate of sodium.

By mixing the silicate of sodium and soap- 40 stone with the sawdust while it is wet or moist the particles of sawdust become coated with a binding agent and a fireproofing agent, thus producing a compact material in which the fireproofing substance is thoroughly distributed throu h the material. After the mixture of saw ust, ga lstone and flat nafnsodiumhaslibeenumolded or pressed into sliajgef said mixtureistneated with a hardening solution, preferably a solution formed of chlorid of zinc or of sulfid of zinc or calcium on mixed with water. I have found in practlce that an inexpensive and very efiicient fire roof material can be produced from the ollowing ingredients mixted togethiiir din approximately the propor 1on s spec e :saw ust 46 parts silicate of sodium 26 pmstone 2m a wa er parts. filter the mgre ients above-mentioned have been thoroughly mixed together and molded so as to form a 0 sheet or object said sheet or object is immersed in a solution consisting of about 25 parts of chlorid of zinc and 75 arts'bf water. o no w1s 1 to be un erstood, Mr, that the proportions above-mentioned are absolutel essential for they could be varied without dl iparting from the spirit of my invention.

A substance or com osition of the character above-described orms a very eflicient fireproof material on account of the fact that the base or body of same consists of numerous small particles of sawdust or some other suitable material that is a non-conductor or poor conductor of heat, which particles are coated with a fireproofing agent. In other words, the fireproofing agent is thoroughly distributed throughout the substance that forms the base of the material. in such a manner that the interior of the material is just as fireproof as the outer surface of the material irrespective of the thickness of the material. Such material is inexpensive to manufacture on account of the fact that the base of same consists of sawdust which is usually considered a waste product; the material is very light and'exceptionally strong and is well, adapted for fireproofing safes, thereby making it possible to build a fireproof safe that is light enough to be handled conveniently. When the material is made in sheet form it can be used as a fireproof lining for sheet metal structures, for covering studding so as to form partitions, and in various other ways for building purposes because it is stiff and strong and can be sawed as easily as boards. The particular purpose for which the material is used is, of course, immaterial so far as my invention is concerned, and, as previously stated, it is immaterial whether the material is made in sheet form or molded to form a finished object.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A fireproof material comprising the following ingredients mixed in approxi mately the portions specified: sawdust, 46 In testimony whereof I hereunto afiix my parts, silicate of sodium, 26 parts, soapstone, signature in the resence of two witnesses, 10 22 parts, and water, six parts. this fourth day 0 October, 1912.

2. A fireproof material consistin of a -5 molded mixture comprising the 0 owing CHARLES HOSS- ingredients: approximatel one-half saw- Witnesses:

dust, approximately oneourth soapstone, WELLS L. CHURCH, water and zinc silicate. GEORGE BAKEWELL.

copies of this potent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

